/usr/share/doc/gir1.2-gcr-3/README

GCR is a library for displaying certificates, and crypto UI, accessing
key stores. It also provides the viewer for crypto files on the GNOME
desktop.
GCK is a library for accessing PKCS#11 modules like smart cards, in a
(G)object oriented way.
DEBUG TRACING
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The Gcr and Gck libraries contain statements which help debug flow
and logic. In many cases these help you track down probl
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